Just got in the Apache, getting ready for my first run. Half-way in, my game crashed. I told the second Apache, and they thought "Hey! We can go for it!". They came in from the same angle, and exactly where we crashed, they crashed as well.
It sucked. So bad.

When a full Squad wondered into a building I was semi AFK in.when I came out of the room they all had there backs to me standing in a line I knifed 2 the rest where dazed and confused I pulled my AK74 out to spray the rest with some 5.45mm goodness and CTD.

I crashed to desktop with no warning, no PC speaker beep, nothing... just straight to desktop just as I was coming in for a landing in a Chinook on Operation Archer on the castle.

I was coming in hot, taking fire, and doing a very fast touch-and-go drop off to storm the castle, but that never happened, because the full chopper I was flying happened to slam into the side of the castle at full speed... because I crashed to desktop about 50 feet from landing the stupid chopper.

EDIT: Another time I managed to "sneak up" on the unknown cache in Al Basrah as Blufor, and it wasn't ghosting or anything like that, I just got lucky when I crashed my jeep into a small village in the west side of the map, got out and took cover, and the building I took cover in had a cache in it. So I got out my C4 because I had the Combat Engineer kit, placed it, got out of the building, and just as I was about to blow it up, CTD.